Former CIA Director John BrennanJohn Owen BrennanBrennan on Trump calling Omarosa a dog: You'll never be a 'good, decent, & honest person' John Brennan rips Trump on Twitter about what it means to be 'presidential' What would the intelligence community's 'insurance policy' against Trump look like? MORE on Friday went after President TrumpDonald John TrumpDems make history, and other takeaways from Tuesday's primaries Pawlenty loses comeback bid in Minnesota Establishment-backed Vukmir wins Wisconsin GOP Senate primary MORE over his attacks on former FBI Director James ComeyJames Brien ComeyOmarosa is case of false friend dilemma with few legal options John Brennan rips Trump on Twitter about what it means to be 'presidential' Is the ‘Ferguson Effect’ to blame for the carnage in Chicago? MORE, tweeting that Trump’s “kakistocracy is collapsing after its lamentable journey.”

“As the greatest Nation history has known, we have the opportunity to emerge from this nightmare stronger & more committed to ensuring a better life for all Americans, including those you have so tragically deceived,” Brennan tweeted at Trump.

A kakistocracy is a form of government in which the worst persons are in power.

Brennan has been a regular critic of Trump, warning last month that lawmakers who protect him will face "a reckoning."

If anything, his criticisms have become more pronounced in the last few months. 

Trump lashed out at Comey in a pair of tweets early Friday, calling him a “leaker & liar” and an “untruthful slime ball.” 

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The attack came after multiple media outlets reported on excerpts of Comey’s upcoming book.

Comey writes in the book that Trump had asked him to probe the infamous “pee tape” mentioned in the so-called Steele dossier in order to disprove its existence. The dossier alleges that Trump hired prostitutes to urinate on a bed used by former President Obama and first lady Michelle ObamaMichelle LeVaughn Robinson ObamaDems ready to move past Michelle Obama’s ‘go high’ message Obamas greeted by screaming fans at Martha's Vineyard Kamala Harris tied with Bernie Sanders as betting favorite for 2020 Dems MORE at the Moscow Ritz-Carlton.

Comey also ripped Trump as "untethered to truth" in the book and compared him to a mob boss.

“A Higher Loyalty: Truth, Lies, and Leadership” comes out Tuesday.